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参数资料
| 型号： | D1723GF |
| 厂商： | NEC Corp. |
| 英文描述： | PLL FREQUENCY SYNTHESIZER AND CONTROLLER FOR FM/MW/LF TUNER CAR AUDIO |
| 中文描述： | 锁相环频率合成器和控制器的调频/中波/低频调谐器汽车音响 |
| 文件页数： | 39/80页 |
| 文件大小： | 1590K |
| 代理商： | D1723GF |
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39
μ
PD1723GF-013,
μ
PD1723GF-213
Function
Symbol
When the auto local function is used, each time the
key is pressed, the local
mode is switched as shown below.
LOCAL1
→
LOCAL2
→
DX
→
auto memory stop
When the local mode is switched, the auto memory operation is repeated from the
frequency at which is started. When the auto memory operation was stopped, if even one
broadcast station was written, operation shifts automatically from the preset memory
when the auto memory operation started to preset scan operation.
Autotuning (seek operation) key.
The frequencies are incremented (
key) or decremented (
key) in
1 channel space and whether or not there is a broadcast station (IF count and SD signal) is
detected at each receiving frequency and when there is a broadcast station, that frequency is
held.
On the VF band, when there is judged to be a broadcast station by IF count and SD signal, the
SK switch is checked 250 to 375 ms later and if there is an SK signal, that frequency is held.
When seek up (seek down) reaches the highest (lowest) frequency, it returns to the lowest
(highest) frequency and, that is, sawtooth wave mode tuning is performed.
The channel seek up (seek down) operation is shown below:
SEEK UP
SEEK DWN
Seek Up
Seek Down
When band switching is performed during the seek operation (no broadcast station), when
switching returns to the same band and when the radio is turned off (including mode
switching) and then turned back on, the frequency at which seek started is received.
The keys that are valid during the seek operation are shown in the following table.
Keys that are not shown are invalid. (
key is valid.)
When using the
and
keys, set the AUTO500 switch (diode matrix)
to 0.
POWER
SEEK UP
SEEK DWN
PSCAN
AMEMO
SEEK UP
SEEK DWN
1
F
F
F
Start
F
S
Stop
1
F
Stop
F
F
F
Start
S
For the S (slow) and F (fast) IF count conditions, see the FMIF pin and AMIF pin above.
For the 1 channel space frequency width, see the receiving frequencies above.
PSCAN
AMEMO
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